Аннотация

Finite energy sum rules for vector and axial-vector currents are derived in a thermal medium in order to provide constraints for the spectral behavior of rho and a1 mesons at non-vanishing temperature and hence to study the tendency toward chiral symmetry restoration. The parity mixing ansatz for the rho and a1 spectrum, including finite widths, is investigated as a function of temperature. Characteristic differences between vector and axial-vector channels are discussed concerning the implementation of the chiral symmetry breaking scale, 4 pi times the pion decay constant, in the sum rule approach.

Описание

Vector mesons at finite temperature and QCD sum rules

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